JPS61256936A - Production of optical fiber - Google Patents
Production of optical fiberInfo
- Publication number
- JPS61256936A JPS61256936A JP60094669A JP9466985A JPS61256936A JP S61256936 A JPS61256936 A JP S61256936A JP 60094669 A JP60094669 A JP 60094669A JP 9466985 A JP9466985 A JP 9466985A JP S61256936 A JPS61256936 A JP S61256936A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- outside diameter
- outer diameter
- strand
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000007789 gas Substances 0.000 claims abstract description 18
- 238000009987 spinning Methods 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 239000011347 resin Substances 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 14
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 11
- 239000011248 coating agent Substances 0.000 abstract description 10
- 238000000576 coating method Methods 0.000 abstract description 10
- 229920002050 silicone resin Polymers 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 239000000835 fiber Substances 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 208000012886 Vertigo Diseases 0.000 abstract 3
- 238000005259 measurement Methods 0.000 abstract 1
- 239000011247 coating layer Substances 0.000 description 15
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/106—Single coatings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、紡糸して得た光ファイバ素線に樹脂を被覆し
つつ形成した光ファイバを外径測定しながら巻き取る光
ファイバの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for manufacturing an optical fiber, in which an optical fiber obtained by spinning is coated with a resin and then formed, and then wound while measuring the outer diameter. .
（発明の技術的背景とその問題点）
従来の光ファイバの製造方法は、第３図に示すように、
送り機構９に取り付けたプリフォームロッド１を加熱炉
２に徐々に挿入して加熱、溶融し、延伸することにより
光ファイバ素線３を紡糸する。次に、この光ファイバ素
線３を熱硬化型シリコーン樹脂４の供給されているコー
ティングアプリケータ５を通過させてその表面に樹脂４
から成る被覆層を設ける。そして、この被覆層を有する
光ファイバ素線３を更に硬化炉６に通して被覆層を加熱
、硬化することにより光ファイバ３′を形成し、この光
ファイバ３′を硬化炉６の直下に配した外径測定器７に
てその外径を測定しつつキャプスタンローラ８を介して
巻取ドラム（図示せず）に巻き取る。(Technical background of the invention and its problems) The conventional optical fiber manufacturing method is as shown in FIG.
The preform rod 1 attached to the feeding mechanism 9 is gradually inserted into the heating furnace 2, heated, melted, and drawn to spin an optical fiber 3. Next, this optical fiber strand 3 is passed through a coating applicator 5 supplied with a thermosetting silicone resin 4, and the resin 4 is coated on the surface of the coating applicator 5.
A coating layer consisting of is provided. Then, the optical fiber 3 with this coating layer is further passed through a curing furnace 6 to heat and harden the coating layer to form an optical fiber 3', and this optical fiber 3' is placed directly under the curing furnace 6. While measuring its outer diameter with an outer diameter measuring device 7, the film is wound onto a winding drum (not shown) via a capstan roller 8.
ところで、熱硬化型シリコーン樹脂４から形成される被
覆層は、硬化炉６内で約５００℃〜６００℃の硬化温度
により加熱、硬化される。また、これにより得られる光
ファイバ３′は通常は数１０ｍ／分の紡糸速度で引き取
られている。従って、上述したように、外径測定器７を
硬化炉６の直下に配する場合には、光ファイバ３′はそ
の被覆層が十分に冷えきらないうちに外径測定器７にて
外径が測定される。By the way, the coating layer formed from the thermosetting silicone resin 4 is heated and cured in a curing furnace 6 at a curing temperature of about 500°C to 600°C. Further, the optical fiber 3' thus obtained is usually drawn at a spinning speed of several tens of meters/minute. Therefore, as described above, when the outer diameter measuring device 7 is disposed directly below the curing furnace 6, the outer diameter measuring device 7 measures the outer diameter of the optical fiber 3' before the coating layer has sufficiently cooled. is measured.
しかし、上記熱硬化型シリコーン樹脂４の線膨−争
張係数はｌＸ１０７℃と比較的大きいので、上述したよ
うに外径測定器７を硬化炉６の直下に配するだけでは、
光ファイバ３′は被覆層が膨張している状態で外径が測
定されてしまう。従って、外径測定器７からの検出信号
により紡糸速度を制御しても実際には所望する外径より
も小さな外径を有する光ファイバが得られてしまう。However, since the linear expansion coefficient of the thermosetting silicone resin 4 is relatively large at 1×107° C., simply placing the outer diameter measuring device 7 directly below the curing furnace 6 as described above will not work.
The outer diameter of the optical fiber 3' is measured while the coating layer is expanded. Therefore, even if the spinning speed is controlled by the detection signal from the outer diameter measuring device 7, an optical fiber having an outer diameter smaller than the desired outer diameter is actually obtained.
（発明の目的）
本発明の目的は、所定外径を有する光ファインくを製造
することができる光ファイバの製造方法を提供すること
にある。(Object of the Invention) An object of the present invention is to provide a method for manufacturing an optical fiber that can manufacture an optical fiber having a predetermined outer diameter.
（発明の概要）
本発明は、外径測定前に光ファイバにガスを吹き付けて
冷却することを特徴とする。(Summary of the Invention) The present invention is characterized in that the optical fiber is cooled by blowing gas onto it before measuring the outer diameter.
（発明の実施例）
以下、本発明の実施例を図面を参照して詳細に説明する
。(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図には、本発明方法に用いる製造装置が示されてお
り、プリフォームロッド１は送り機構９に取り付けられ
ている。プリフォームロッド１の下方には加熱炉２が配
され、加熱炉２の下方にはコーティングアプリケータ５
が配されている。FIG. 1 shows a manufacturing apparatus used in the method of the invention, in which a preform rod 1 is attached to a feed mechanism 9. As shown in FIG. A heating furnace 2 is arranged below the preform rod 1, and a coating applicator 5 is placed below the heating furnace 2.
are arranged.
コーティングアプリケータ５内には熱硬化型シリコーン
樹脂４が供給されている。コーティングアプリケータ５
の下方には硬化炉６が配され、その下方には更に冷却管
１０が配されている。この冷却管１０にはガス冷却器１
１が接続され、ガス冷却器１１には圧力ボンベ１２が接
続されている。A thermosetting silicone resin 4 is supplied into the coating applicator 5 . Coating applicator 5
A hardening furnace 6 is arranged below the curing furnace 6, and a cooling pipe 10 is further arranged below it. This cooling pipe 10 has a gas cooler 1
1 is connected to the gas cooler 11, and a pressure cylinder 12 is connected to the gas cooler 11.
こノ圧力ポンベ１２には乾燥したＮ２ （窒素）ガス
が封入されている。冷却管１０の下方には、外径測定器
７及びキャプスタンローラ８が配されている。外径測定
器７は、Ｈｅ−Ｎｅレーザ光線を音さ偏向器とレンズに
より数百ＭＨｚの平行な振動スポットにして光ファイバ
３′を走査する走査部と、レーザ光線を受光し、受光量
を光電変換する検出部とから成り、光ファイバ３′外径
を非接触で測定する。This pressure pump 12 is filled with dry N2 (nitrogen) gas. An outer diameter measuring device 7 and a capstan roller 8 are arranged below the cooling pipe 10. The outer diameter measuring device 7 includes a scanning section that converts a He-Ne laser beam into a parallel vibration spot of several hundred MHz using a tuning fork deflector and a lens and scans the optical fiber 3', and a scanning section that receives the laser beam and measures the amount of received light. It consists of a detection section that performs photoelectric conversion, and measures the outer diameter of the optical fiber 3' without contact.
次に、本発明の製造方法を説明する。Next, the manufacturing method of the present invention will be explained.
プリフォームロッド１の下端を加熱炉２にて２ｏ ｏ
ｏ ’ｃ前後で加熱、溶融し、延伸することにより光フ
ァイバ素線３を、例えば、外径が１２５゜ｍになるよう
に４０ｍ／分の速度で紡糸する。The lower end of preform rod 1 is heated to 2 o o in heating furnace 2.
By heating, melting and drawing at around o'c, the optical fiber 3 is spun at a speed of 40 m/min so that the outer diameter becomes 125°, for example.
次いで、光ファイバ素線３をコーティングアプリケータ
５を通過させ、その表面に熱硬化型シリコーン樹脂４か
ら成る被覆層を連続的に設ける。Next, the optical fiber 3 is passed through a coating applicator 5, and a coating layer made of a thermosetting silicone resin 4 is continuously provided on its surface.
そして、この光ファイバ素線３を硬化炉６内に導き、被
覆層を約５５０℃の硬化温度で加熱し、硬化することに
より光ファイバ３′を形成する。Then, this optical fiber strand 3 is introduced into a curing furnace 6, and the coating layer is heated and cured at a curing temperature of about 550° C., thereby forming an optical fiber 3'.
光ファイバ３′を形成した後は該光ファイバ３′を冷却
管１０に案内する。圧力ポンベ１２からのＮ２ガスは、
ガス冷却器１１にて冷却され、冷却管１０内に圧送され
ている。従って、光ファイバ３′には、冷却された乾燥
Ｎ２ガスが吹き付けられるので、光ファイバ３′が冷却
管１０を通過した時点で硬化炉６にて加熱、硬化された
被覆層は冷却される。After forming the optical fiber 3', the optical fiber 3' is guided into the cooling pipe 10. The N2 gas from the pressure pump 12 is
It is cooled by a gas cooler 11 and fed under pressure into a cooling pipe 10. Therefore, since cooled dry N2 gas is blown onto the optical fiber 3', the coating layer heated and hardened in the curing furnace 6 is cooled when the optical fiber 3' passes through the cooling pipe 10.
最後に、この冷却された光ファイバ３′を外径測定器７
にて外径を測定しつつキャプスタンローラ８を介して巻
取ドラムに巻き取る。Finally, this cooled optical fiber 3' is connected to an outer diameter measuring device 7.
While measuring the outer diameter, the film is wound onto a winding drum via a capstan roller 8.
このように、光ファイバ３′を冷却すると、硬化炉６の
加熱で膨張していた被覆層が収縮し、所定の被覆厚に戻
るので、光ファイバ３′の外径を外径測定器７により正
確に測定することができる。従って、外径測定器７から
の外径検出信号により紡糸速度を制御することで、所望
外径の光ファイバ３′を得ることができる。As described above, when the optical fiber 3' is cooled, the coating layer, which had expanded due to the heating in the curing furnace 6, contracts and returns to the predetermined coating thickness. Can be measured accurately. Therefore, by controlling the spinning speed using the outer diameter detection signal from the outer diameter measuring device 7, an optical fiber 3' having a desired outer diameter can be obtained.
また、光ファイバ３′にＮ２ガスを吹き付けると、光フ
ァイバ３′に付着していた塵等を吹き飛ばすことができ
るので、光ファイバ３′表面を清浄に保持することもで
きる。Further, by blowing N2 gas onto the optical fiber 3', dust and the like attached to the optical fiber 3' can be blown away, so that the surface of the optical fiber 3' can be kept clean.
上記実施例では、Ｎ２ガスを光ファイバ３′に吹き付け
たが、その他の不活性ガスを吹き付けてもよく、又フィ
ルタにて浄化した空気を吹き付けるようにしてもよい。In the above embodiment, N2 gas was blown onto the optical fiber 3', but other inert gases may be blown onto the optical fiber 3', or air purified by a filter may be blown onto the optical fiber 3'.
また、Ｎ２ガス等は必ずしも冷却して吹き付ける必要が
なく、常温で吹き付けてもよい。Further, N2 gas and the like do not necessarily need to be cooled before being sprayed, and may be sprayed at room temperature.
尚、上記実施例では、光ファイバ素線３に熱硬化型シリ
コーン樹脂４を被覆してＮ２ガスを吹き付ける例が示さ
れているが、紫外線硬化型樹脂を被覆する場合でも被覆
層が紫外線照射で約６００℃に加熱され、膨張するので
、本発明を適用することにより光ファイバ外径を正確に
測定することができる。In the above embodiment, an example is shown in which the optical fiber 3 is coated with thermosetting silicone resin 4 and N2 gas is sprayed, but even when coating with ultraviolet curable resin, the coating layer may not be exposed to ultraviolet irradiation. Since it is heated to about 600° C. and expanded, the outer diameter of the optical fiber can be accurately measured by applying the present invention.
ところで、光ファイバの被覆層は空気中で自然放熱させ
ることによっても徐々に冷却して所定の被覆厚に戻る。By the way, the coating layer of the optical fiber gradually cools down to a predetermined coating thickness by allowing heat to radiate naturally in the air.
そこで、外径１２５ｇｍで紡糸した光ファイバ素線３に
上述したように、熱硬化型シリコーン樹脂４を被覆し、
硬化炉６から出た直後の光ファイバ外径の変化を複数の
外径測定器７にて測定した。この結果を第２図（Ａ）に
示す。Therefore, the optical fiber 3 spun with an outer diameter of 125 gm was coated with a thermosetting silicone resin 4 as described above.
Changes in the outer diameter of the optical fiber immediately after leaving the curing furnace 6 were measured using a plurality of outer diameter measuring instruments 7. The results are shown in FIG. 2(A).
尚、この図では硬化炉６から各外径測定器７までの距離
を空冷長として示した。また、紡糸速度は４０ｍ／分で
あった。この第２図（Ａ）から明らかなように、被覆層
が収縮し、光ファイバの外径が安定するには少なくとも
１ｍ以上の空冷長（最低空冷長）が必要である。In this figure, the distance from the curing furnace 6 to each outer diameter measuring device 7 is shown as the air cooling length. Moreover, the spinning speed was 40 m/min. As is clear from FIG. 2(A), an air-cooled length (minimum air-cooled length) of at least 1 m is required for the coating layer to shrink and for the outer diameter of the optical fiber to be stabilized.
また、紡糸速度を変化させると、第２図（Ｂ）に示すよ
うに、紡糸速度の増大に伴って最低空冷長も増加し、８
０ｍ／分及び１００ｍ／分の紡糸速度の場合にはそれぞ
れ約２ｍと約２．７ｍの空冷長が必要であった。Furthermore, when the spinning speed is changed, the minimum air cooling length also increases as the spinning speed increases, as shown in Figure 2 (B).
For spinning speeds of 0 m/min and 100 m/min, air cooling lengths of about 2 m and about 2.7 m were required, respectively.
これに対して、本発明のように冷却したＮ２ガスを吹き
付ける場合には、冷却管１０の冷却長は約３０ｃｍ程度
で十分であった。従って、本発明方法によれば装置規模
を大きくすることなく光ファイバを所定外径で製造する
ことができる。On the other hand, in the case of spraying cooled N2 gas as in the present invention, a cooling length of about 30 cm of the cooling pipe 10 was sufficient. Therefore, according to the method of the present invention, an optical fiber can be manufactured with a predetermined outer diameter without increasing the scale of the apparatus.
（発明の効果）
本発明によれば、紡糸されて被覆層が硬化炉にて加熱、
硬化されてきた光ファイバにガスを吹き付け、光ファイ
バの被覆層を冷却した後その外径を測定するようにした
ことで、装置規模を大きくすることなく光ファイバ外径
を正確に測定しつつ光ファイバを製造することができる
。従って、所望外径を有する光ファイバを得ることがで
きる。(Effects of the Invention) According to the present invention, the spun coating layer is heated in a curing furnace,
By spraying gas onto the hardened optical fiber and measuring the outer diameter after cooling the coating layer of the optical fiber, it is possible to accurately measure the outer diameter of the optical fiber without increasing the scale of the equipment. Fibers can be manufactured. Therefore, an optical fiber having a desired outer diameter can be obtained.
第１図は未発明の製造方法に用いられる装置を概略的に
示す図、第２図（Ａ）、（Ｂ）は光ファイバ外径と空冷
長及び紡糸速度と空冷長の関係をそれぞれ示す特性図、
第３図は従来の製造方法を説明するための概略図である
。
１−−−−−−−−−ブリ７オームロツド、３−−−−
−−−−一光ファイバ素線、３ ’−−−−−−−−光
ファイバ、
４−−−−一−−−−熱硬化型シリコーン樹脂、６−−
−−−−−−−硬化炉。
（他１名）
第１図
７−−−−−−−−−外径測定器
第２図
（〜
（Ｂ）
！ｆＪ系遼友（ｍ渕）
第３図Figure 1 is a diagram schematically showing the equipment used in the uninvented manufacturing method, and Figures 2 (A) and (B) are characteristics showing the relationship between the optical fiber outer diameter and air-cooled length, and the spinning speed and air-cooled length, respectively. figure,
FIG. 3 is a schematic diagram for explaining a conventional manufacturing method. 1-------Bri 7 ohm rod, 3-------
----1 Optical fiber wire, 3'-- Optical fiber, 4---1--Thermosetting silicone resin, 6--
−−−−−−−Hardening furnace. (1 other person) Fig. 1 7 ------- External diameter measuring device Fig. 2 (~ (B) !fJ series Liaoyu (mbuchi) Fig. 3
Claims (1)
光ファイバ素線に樹脂を被覆し、かつ該樹脂を硬化炉に
て加熱して光ファイバを形成し、該光ファイバをその外
径を測定しつつ巻き取る光ファイバの製造方法であって
、前記光ファイバにガスを吹き付けて冷却した後その外
径を測定することを特徴とする光ファイバの製造方法。 ２、前記ガスは、乾燥させた低温の窒素ガスであること
を特徴とする特許請求の範囲第１項に記載の光ファイバ
の製造方法。[Claims] 1. A preform rod is heated and melted, and an optical fiber obtained by spinning is coated with a resin, and the resin is heated in a curing furnace to form an optical fiber. 1. A method for manufacturing an optical fiber, the method comprising winding an optical fiber while measuring its outer diameter, the method comprising: blowing a gas onto the optical fiber to cool it, and then measuring the outer diameter. 2. The method for manufacturing an optical fiber according to claim 1, wherein the gas is dry, low-temperature nitrogen gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60094669A JPS61256936A (en) | 1985-05-01 | 1985-05-01 | Production of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60094669A JPS61256936A (en) | 1985-05-01 | 1985-05-01 | Production of optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61256936A true JPS61256936A (en) | 1986-11-14 |
| JPH058131B2 JPH058131B2 (en) | 1993-02-01 |
Family
ID=14116644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60094669A Granted JPS61256936A (en) | 1985-05-01 | 1985-05-01 | Production of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61256936A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02197019A (en) * | 1989-01-26 | 1990-08-03 | Mitsubishi Cable Ind Ltd | Manufacture of glass insulating cable |
| WO2001033184A1 (en) * | 1999-10-29 | 2001-05-10 | Pirelli Cavi E Sistemi S.P.A. | Method of measuring the twist imparted to an optical fibre and procedure for processing an optical fibre using this method |
| JP2012224480A (en) * | 2011-04-15 | 2012-11-15 | Sumitomo Electric Ind Ltd | Method for producing optical fiber and production device therefor |
| CN104597560A (en) * | 2015-01-12 | 2015-05-06 | 江苏通鼎光电股份有限公司 | Small outer diameter and low loss fiber for air blowing micro cable and manufacture method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53141048A (en) * | 1977-05-16 | 1978-12-08 | Hitachi Ltd | Production of optical fibers |
| JPS5921545A (en) * | 1982-07-28 | 1984-02-03 | Nippon Telegr & Teleph Corp <Ntt> | Apparatus for coating optical fiber |
-
1985
- 1985-05-01 JP JP60094669A patent/JPS61256936A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53141048A (en) * | 1977-05-16 | 1978-12-08 | Hitachi Ltd | Production of optical fibers |
| JPS5921545A (en) * | 1982-07-28 | 1984-02-03 | Nippon Telegr & Teleph Corp <Ntt> | Apparatus for coating optical fiber |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02197019A (en) * | 1989-01-26 | 1990-08-03 | Mitsubishi Cable Ind Ltd | Manufacture of glass insulating cable |
| WO2001033184A1 (en) * | 1999-10-29 | 2001-05-10 | Pirelli Cavi E Sistemi S.P.A. | Method of measuring the twist imparted to an optical fibre and procedure for processing an optical fibre using this method |
| JP2012224480A (en) * | 2011-04-15 | 2012-11-15 | Sumitomo Electric Ind Ltd | Method for producing optical fiber and production device therefor |
| CN104597560A (en) * | 2015-01-12 | 2015-05-06 | 江苏通鼎光电股份有限公司 | Small outer diameter and low loss fiber for air blowing micro cable and manufacture method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH058131B2 (en) | 1993-02-01 |
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| LAPS | Cancellation because of no payment of annual fees |